More than 30 chemical elements were detected in the airborne particles at Trudeau airport.

While some of these elements are “not dangerous at all,” according to Ariya, others are considered toxic by the United States Environmental Protection Agency.

Researchers found concentrations of zinc, nickel, iron and lead, as well as other heavy metals such as chromium, manganese and arsenic.

https://www.cbc.ca/news/canada/montreal/nanoparticles-trudeau-airport-1.4961482